AVIXA Recognized AV Technologist Practice Test

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Which property of a wave determines the brightness of a light?

frequency

wavelength

amplitude

The brightness of light is primarily determined by the amplitude of the wave. In the context of light waves, amplitude relates to the intensity of the light. A higher amplitude means that the wave carries more energy, resulting in a brighter perception of light. This is similar to how a louder sound is produced by sound waves with greater amplitude.

While frequency and wavelength are also important properties of light waves, they primarily affect the color and energy of the light rather than its brightness. Wavelength determines the color of the light in the visible spectrum, while frequency is inversely related to wavelength and describes how many waves pass a point in a given amount of time. The crest refers to the highest point of a wave, but on its own, it does not provide a measure of brightness. Thus, amplitude is the key factor that defines how bright the light appears to the human eye.

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